Preparation of the polymeric and oligomeric type oxidation catalyst and measurement of catalysis impact

In this study Schiff base complexes made of N-2(2-hyroxyethyloxy) ethyl-2,4-dihydroxy benzaldimine (2,4-DHBAEE), N-2(2-hyroxyethyloxy) ethyl-2,3-dihydroxy benzaldimine (2,3-DHBAEE) and N-2-hyroxyethyl-2,4-dihydroxybenzaldimine (2,4-DHBAE) as the ligands which were prepared as in-situ in the reaction solution and the related transition metal salts were prepared. The preparation of complexes was performend in methanol by using Cu(OAc)2, Ni(OAc)2, PdCl2 as the metal salts. Epoxy polymers containing transition complexes were synthesized via the prepared hydroxyl functional group included Schiff base complexes and diglycidyl ether bisphenol-A (DGEBA) using tetrabutyl ammonium hydroxide (TBAH) as the catalyst. Curing experiments were performed under a nitrogen atmosphere at 150°C and 175 °C. The characterization of the prepared Schiff base complexes were performed by the combination of melting point determinations, MS and FTIR spectroscopy techniques. However the characterization of the epoxy polymer containing Cu2+, Ni2+ and Pd2+complexes were performed with FT- IR spectroscopy. Kinetic studies were carried out by online spectroscopic methods using Morin as natural polyhydroxy phenolic dye to characterize the natural red fruits' dye. Measurements were carried out for the samples prepared as the catalyst in the presence of H2O2 at a buffer solution formed in the range of 10-11 pH. The prepared Schiff base complexes and the epoxy polymers which also contained metal motion were used as the catalysts. The measurement of bleaching kinetics on UV-Vis. spectra was followed by the decreasing of absorbences of Morin at 411 nm with time. The results were graphed as the values of bleaching % against time. In general, it was observed that the complexes had more rapid bleaching kinetics then the polymers. The observed bleache rate order can be given as Cu(II)> Ni (II)> Pd (II).